Furnace.



@- ZULVER.

FURNACE.

' APPLICATION HLED1UNE25. I9l]. 11,270,680. Patented June 25, 1918.

2 SHEETS-SHEET I.

I I l l I I I l I x I u I C. ZULVER.

FURNACE.

APPLICATION FILED JUNE 25. l9l7- 1,270,680. Patented June 25, 1918.

2 SHEETS-SHEET 2.

UNITED STATES PATENT orrron CORNELIS ZULVER, OF LONDON, ENGLAND,ASSIGNOR OF ONE-HALF TO LAUNGELOT EUSTACE SMITH, SOUTH SHIELDS, ENGLAND.

FURNACE.

Specification of Letters Yatent.

Patented June 25, 1918.

To all whom it may concern:

Be it known that I, CoRNELIs ZULvnR, a subject of the Queen of theNetherlands, residing at St. Helens Court, Great St. Helens, in the cityof London, England, have invented a new and useful Improvement in andRelating to Furnaces, of which the following is a specification.

This invention relates to furnaces burning either liquid or solid fuelas desired, and consists in an improved construction of furnace frontdesigned for liquid fuel burning, which front takes the place of theordinary fire door used for coal burning. With the improved furnacefront more efiicient combustion is obtained when burning liquid fuel,and it is designed particularly with a view to utilizing the same frontfor either liquid or solid fuel combustion in a marine or other type ofsteam boiler, while quick changing over or conversion to either fuel canbe effected without expense or loss of time.

A furnace front according to this invention is illustrated in theaccompanying drawings, in which Figure 1 is a view in longitudinalsection of a boiler furnace provided with the improved furnace front forli uid fuel, and

Fig. 2 is a front view of the urnace front.

Figs. 3 and 4 are respectively a front view and a vertical section ofthe usual fire door which replaces the furnace front when burning solidfuel.

According to this invention the furnace front comprises an oblong,square, boxform, or other suitably shaped attachment, which is bolted tothe furnace front plate 2 and is closed at the front by a sliding plate3 capable of being moved along supports 4 to adjust auxiliary airadmission to the fuel burner or burners 5. The attachment 1, is, forexample, in the form of a cylinder. The burner or burners is or aremounted upon a box 6 furnished with distributing valves 7 for regulatingthe fuel sup ly.

T e burner box 6 is attached to a cast-iron dome piece or battle 8within the aforesaid cylinder 1 and said battle is formed with suitablyshaped air openings 9. The size or shape of the air openings and theform of the dome may be varied as found most effective.

The lower half or ashpit 10 of the furnace is closed by a portable plate11 in which one, two or more tubes 12 are fitted extending into theash-pit. Through these tubes, of which the length may be varied, theprincipal amount of air is introduced to the furnace for combustion. Theamount of air is regulated through the tubes by means of sliding doors13. The air travels through the tubes and returns to the front of thefurnace where it impinges upon the firebars 14 and becomes heated beforemixing with the burner-spray. The heated air onters the furnace througha square or oblong opening 15 formed in the dead plate 16, and thenmeets the fuel spray at right angles, or nearly so, whereby a thoroughadmixture of air and fuel is obtained. The sole object of the air-tubes12 is to provide a convenient method of heating the air supportingcombustion before mixing with the fuel spray, hot air being an essentialcondition to obtain complete and smokeless combustion of liquid fuel,the air also keeping the firebars cool.

The fire-bars are covered with one or two layers of fire-resistingmaterial or ordinary fire bricks 17.

Heated oil under pressure is forced through the burners and theair-supply is adjusted by means of the dampers until smokelesscombustion and bright flame is obtained.

To adapt the furnace to coal burning all that is necessary is to removethe brick covering 17 and to replace the cylindrical furnace-front 1 bythe ordinary furnace door 18, as shown in Figs. 3 and 4, and to removethe plate 11 with the tubes 12 closing the lower half of the furnace.The openings in the dead plate are closed by means of plates 19 whichare loosely fitted in, This change can be made quickly and Without lossof time to the steamer, either When bunkering or at sea. What I claim asmy invention and desire to secure by Letters Patent, is

V In a furnacathe' combination with a furnace front having a fuel supplyopening, a bafile formed'ewith air inlet openings, With 7 scribed;

means to inclose said baflie, of a plate closing the ashpit of thefurnace, and air supply tubes attached to said plate andextending; intothe, ashpit, substantially as .de-

Washingtnmj. G."

ww le 7' Copies of this patent may be obtained for five cents each; bya-d'r lressin'g the flommissioner ct Patents,

